Definition of firebug noun from the Oxford Advanced Learner's Dictionary

 

firebug

 noun
noun
BrE BrE//ˈfaɪəbʌɡ//
 
; NAmE NAmE//ˈfaɪərbʌɡ//
 
(informal)
 
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a person who deliberately starts fires synonym arsonist
See the Oxford Advanced American Dictionary entry: firebug